While that's a good answer, I'll play devil's advocate here. The SB6141 will certainly give you rock steady connection speeds, but your real world experience won't change one single bit. Surfing will not feel faster, downloads will not be noticably improved, but the benchmarks might make you feel better.

There's still a decent market for the 6121, so you probably won't be out of pocket too much if you do the swap. Just ask yourself if the warm & fuzzies from the improved benchmarks will justify that cost for you - if so, go for it,

No, it won't be obsolete. You'll need to have a very high speed connection to see the difference between the 121 and 141. Based on other SurfBoard modems that have been out there for a long time, the 121 will do just fine for the next 10 years.

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